High-power filtering switch with low loss and high isolation based on dielectric resonator

Abstract

A filtering switch based on dielectric resonator is disclosed which comprising a rectangular dielectric resonator, a metal cavity in which the dielectric resonator is located, a switch circuitry and a T-shape feeding line structure. The ON- and OFF-states of the filtering switch based on dielectric resonator are realized by controlling a coupling between the dielectric resonator and the feeding line structure. EM fields of the rectangular dielectric resonator and T-shape feeding line structure have been theoretically analyzed and utilized to guide the coupling control. The results have shown low ON-state loss, high power capability and high OFF-state isolation. Transmission zeros are generated at both sides of the passband by cross coupling between dielectric resonators or between feeding line structures and coupling line structures, resulting in high skirt selectivity.